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Annotation of 43BSDTahoe/new/X/libibm/libsrc/makemask.h, revision 1.1.1.1

1.1       root        1: /* $Header: makemask.h,v 10.1 86/11/19 10:45:51 jg Exp $ */
                      2: /* makemask.h -  Defines, constants, structures and globals
                      3:  *               use by MakeMask()
                      4:  *
                      5:  *     Author:
                      6:  *             Scott Bates
                      7:  *             Brown University
                      8:  *             IRIS, Box 1946
                      9:  *             Providence, RI 02912
                     10:  *
                     11:  *
                     12:  *             Copyright (c) 1986 Brown University
                     13:  *
                     14:  * Permission to use, copy, modify and distribute this software and its
                     15:  * documentation for any purpose and without fee is hereby granted, provided
                     16:  * that the above copyright notice appear in all copies, and that both
                     17:  * that copyright notice and this permission notice appear in supporting
                     18:  * documentation, and that the name of Brown University not be used in
                     19:  * advertising or publicity pertaining to distribution of the software
                     20:  * without specific, written prior permission. Brown University makes no
                     21:  * representations about the suitability of this software for any purpose.
                     22:  * It is provided "as-is" without express or implied warranty.
                     23:  */
                     24: 
                     25: /*
                     26:  * Edge table entry
                     27:  */
                     28: 
                     29: static struct edge {
                     30:     struct edge *NextEdge;     /* pointer to next edge */
                     31:     long       Delta_X;        /* change in x per scan line */
                     32:     long       Min_X;          /* current x value */
                     33:     short      Max_Y;          /* last scan line of edge */
                     34: };
                     35: 
                     36: /*
                     37:  * Ploygon 
                     38:  */
                     39: 
                     40: static struct Polygon {
                     41:        Vertex  *PolyPoints;    /* pointer to list of points */
                     42:        int     PolyCount;      /* number of points in polygon */
                     43: };
                     44: 
                     45: /*
                     46:  * Left and right mask values used by FillMask()
                     47:  */
                     48: 
                     49: static long LeftMasks[] = {
                     50:        0x80000000, 0xC0000000, 0xE0000000, 0xF0000000,
                     51:        0xF8000000, 0xFC000000, 0xFE000000, 0xFF000000,
                     52:        0xFF800000, 0xFFC00000, 0xFFE00000, 0xFFF00000,
                     53:        0xFFF80000, 0xFFFC0000, 0xFFFE0000, 0xFFFF0000,
                     54:        0xFFFF8000, 0xFFFFC000, 0xFFFFE000, 0xFFFFF000,
                     55:        0xFFFFF800, 0xFFFFFC00, 0xFFFFFE00, 0xFFFFFF00,
                     56:        0xFFFFFF80, 0xFFFFFFC0, 0xFFFFFFE0, 0xFFFFFFF0,
                     57:        0xFFFFFFF8, 0xFFFFFFFC, 0xFFFFFFFE, 0xFFFFFFFF,
                     58: };
                     59: 
                     60: static long RightMasks[] = {
                     61:        0xFFFFFFFF, 0x7FFFFFFF, 0x3FFFFFFF, 0x1FFFFFFF,
                     62:        0x0FFFFFFF, 0x07FFFFFF, 0x03FFFFFF, 0x01FFFFFF,
                     63:        0x00FFFFFF, 0x007FFFFF, 0x003FFFFF, 0x001FFFFF,
                     64:        0x000FFFFF, 0x0007FFFF, 0x0003FFFF, 0x0001FFFF,
                     65:        0x0000FFFF, 0x00007FFF, 0x00003FFF, 0x00001FFF,
                     66:        0x00000FFF, 0x000007FF, 0x000003FF, 0x000001FF,
                     67:        0x000000FF, 0x0000007F, 0x0000003F, 0x0000001F,
                     68:        0x0000000F, 0x00000007, 0x00000003, 0x00000001,
                     69: };
                     70: 
                     71: /*
                     72:  * global variables
                     73:  */
                     74: 
                     75: static int EdgeCount;
                     76: static struct edge **EdgeTable;
                     77: static struct edge *Edges;
                     78: static int Direction;
                     79: static int ShortenStartOfEdge;

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